抄録
In this paper, an indoor GPS signals acquisition scheme based on duffing oscillators array is introduced. The main concept of this acquisition scheme is to utilize character of chaotic system, which is sensitive to periodic signals and immune to noise at the same time. Firstly, we decide whether weak GPS signals exist or not by means of the Lyapunov Exponents (LE) algorithm. Finally, the code phase is obtained by means of above discussion result by coherent integration technique. By implementing rigorous mathematical analysis, this paper proves that this acquisition scheme based on duffing oscillators array consumes less acquisition time, and is capable of detecting weak GPS signals. Simulation results prove also the advantage on detecting indoor GPS signals.
